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diff --git a/2966/CH1/EX1.18/1_18.sce b/2966/CH1/EX1.18/1_18.sce
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+//water//
+//page 1.31 example 2//
+clc    
+Purity_Lime=.90
+Purity_soda=.95
+W1=156;//amount of Mg(HCO3)2 in ppm//
+W2=4.9;//amount of H2SO4 in ppm//
+W3=23.75;//amount of MgCl2 in ppm//
+W4=5.6;//amount of NaCl in ppm//
+W5=111;//amount of CaCl2 in ppm//
+W6=16.2;//amount of SiO2 in ppm//
+M1=100/146;//multiplication factor of Mg(HCO3)2//
+M2=100/98;//multiplication factor of H2SO4//
+M3=100/95;//multiplication factor of MgCl2//
+M5=100/111;//multiplication factor of CaCl2//
+P1=W1*M1;//in terms of CaCO3//2*L
+P2=W2*M2;//in terms of CaCO3//L+S
+P3=W3*M3;//in terms of CaCO3//L+S
+P5=W5*M5;//in terms of CaCO3//S
+printf ("We do not take NaCl and SiO2 since they do not react with lime/soda");
+V=50000;//volume of water in litres//
+L=0.74*(2*P1+P2+P3)*V/Purity_Lime;//lime required in mg//
+L=L/10^3;
+printf("\n Amount of Lime required is %.2f g",L);
+S=1.06*(P2+P3+P5)*V/Purity_soda;//soda required in mg//
+S=S/10^3;
+printf("\n Amount of Soda required is %.2f g",S)
+\ No newline at end of file